Alberto Leoncini Bartoli (born July 10, 1932 in Ancona) is a retired Italian diplomat.

From 1977 to 1980 he headed first the Comecon and thereafter the North Atlantic Council departments in Rome.

From 1996 to 1997 he was appointed chief of protocol of the Ministry of Foreign Affairs.

From 1999 to 2000 he was appointed Secretary General for Internal Affairs of the Sovereign Military Order of Malta.

From 2001 to 2016 he was appointed Ambassador of the Sovereign Military Order of Malta to the Holy See.